{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["hyponym of", "evaluate for", "used for", "part of"], "input": "This is an extremely challenging task because -LRB- i -RRB- visual comparisons not only need to be fine-grained but also executed cross-domain , -LRB- ii -RRB- free-hand -LRB- finger -RRB- sketches are highly abstract , making fine-grained matching harder , and most importantly -LRB- iii -RRB- annotated cross-domain sketch-photo datasets required for training are scarce , challenging many state-of-the-art machine learning techniques ."}
{"hyponym of": [], "evaluate for": [], "used for": [{"subject": "annotated cross-domain sketch-photo datasets", "object": "machine learning techniques"}], "part of": []}